+/*
+ * Copyright (c) 2005 Rene Scharfe
+ */
#include <time.h>
#include "cache.h"
#define RECORDSIZE (512)
#define BLOCKSIZE (RECORDSIZE * 20)
-static const char *tar_tree_usage = "tar-tree <key> [basedir]";
+#define TYPEFLAG_AUTO '\0'
+#define TYPEFLAG_REG '0'
+#define TYPEFLAG_LNK '2'
+#define TYPEFLAG_DIR '5'
+#define TYPEFLAG_GLOBAL_HEADER 'g'
+#define TYPEFLAG_EXT_HEADER 'x'
+
+#define EXT_HEADER_PATH 1
+#define EXT_HEADER_LINKPATH 2
+
+static const char tar_tree_usage[] = "git-tar-tree <key> [basedir]";
static char block[BLOCKSIZE];
static unsigned long offset;
static void reliable_write(void *buf, unsigned long size)
{
while (size > 0) {
- long ret = write(1, buf, size);
+ long ret = xwrite(1, buf, size);
if (ret < 0) {
- if (errno == EAGAIN)
- continue;
if (errno == EPIPE)
exit(0);
- die("tar-tree: %s", strerror(errno));
+ die("git-tar-tree: %s", strerror(errno));
} else if (!ret) {
- die("tar-tree: disk full?");
+ die("git-tar-tree: disk full?");
}
size -= ret;
buf += ret;
}
}
+/* acquire the next record from the buffer; user must call write_if_needed() */
+static char *get_record(void)
+{
+ char *p = block + offset;
+ memset(p, 0, RECORDSIZE);
+ offset += RECORDSIZE;
+ return p;
+}
+
/*
* The end of tar archives is marked by 1024 nul bytes and after that
* follows the rest of the block (if any).
*/
static void write_trailer(void)
{
- memset(block + offset, 0, RECORDSIZE);
- offset += RECORDSIZE;
+ get_record();
write_if_needed();
- memset(block + offset, 0, RECORDSIZE);
- offset += RECORDSIZE;
+ get_record();
write_if_needed();
- if (offset) {
- memset(block + offset, 0, BLOCKSIZE - offset);
- reliable_write(block, BLOCKSIZE);
- offset = 0;
+ while (offset) {
+ get_record();
+ write_if_needed();
}
}
*p += 1;
}
-static void append_long(char **p, long n)
-{
- int len = sprintf(*p, "%ld", n);
- *p += len;
-}
-
static void append_path_prefix(char **buffer, struct path_prefix *prefix)
{
if (!prefix)
return len;
}
-static void write_header(const char *, const char *, struct path_prefix *,
- const char *, unsigned int, unsigned long);
+static void append_extended_header_prefix(char **p, unsigned int size,
+ const char *keyword)
+{
+ int len = sprintf(*p, "%u %s=", size, keyword);
+ *p += len;
+}
+
+static unsigned int extended_header_len(const char *keyword,
+ unsigned int valuelen)
+{
+ /* "%u %s=%s\n" */
+ unsigned int len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
+ if (len > 9)
+ len++;
+ if (len > 99)
+ len++;
+ return len;
+}
+
+static void append_extended_header(char **p, const char *keyword,
+ const char *value, unsigned int len)
+{
+ unsigned int size = extended_header_len(keyword, len);
+ append_extended_header_prefix(p, size, keyword);
+ memcpy(*p, value, len);
+ *p += len;
+ append_char(p, '\n');
+}
+
+static void write_header(const unsigned char *, char, const char *, struct path_prefix *,
+ const char *, unsigned int, void *, unsigned long);
/* stores a pax extended header directly in the block buffer */
static void write_extended_header(const char *headerfilename, int is_dir,
- const char *basepath,
+ unsigned int flags, const char *basepath,
struct path_prefix *prefix,
- const char *path, unsigned int namelen)
+ const char *path, unsigned int namelen,
+ void *content, unsigned int contentsize)
{
- char *records, *p;
- unsigned int size = 1 + 6 + namelen + 1;
- if (size > 9)
- size++;
- if (size > 99)
- size++;
- if (size > RECORDSIZE)
- die("tar-tree: extended header too big, wtf?");
- write_header(NULL, NULL, NULL, headerfilename, 0100600, size);
-
- records = block + offset;
- memset(records, 0, RECORDSIZE);
- offset += RECORDSIZE;
- p = records;
- append_long(&p, size);
- append_string(&p, " path=");
+ char *buffer, *p;
+ unsigned int pathlen, size, linkpathlen = 0;
+
+ size = pathlen = extended_header_len("path", namelen);
+ if (flags & EXT_HEADER_LINKPATH) {
+ linkpathlen = extended_header_len("linkpath", contentsize);
+ size += linkpathlen;
+ }
+ write_header(NULL, TYPEFLAG_EXT_HEADER, NULL, NULL, headerfilename,
+ 0100600, NULL, size);
+
+ buffer = p = malloc(size);
+ if (!buffer)
+ die("git-tar-tree: %s", strerror(errno));
+ append_extended_header_prefix(&p, pathlen, "path");
append_path(&p, is_dir, basepath, prefix, path);
append_char(&p, '\n');
+ if (flags & EXT_HEADER_LINKPATH)
+ append_extended_header(&p, "linkpath", content, contentsize);
+ write_blocked(buffer, size);
+ free(buffer);
+}
+
+static void write_global_extended_header(const unsigned char *sha1)
+{
+ char *p;
+ unsigned int size;
+
+ size = extended_header_len("comment", 40);
+ write_header(NULL, TYPEFLAG_GLOBAL_HEADER, NULL, NULL,
+ "pax_global_header", 0100600, NULL, size);
+
+ p = get_record();
+ append_extended_header(&p, "comment", sha1_to_hex(sha1), 40);
write_if_needed();
}
/* stores a ustar header directly in the block buffer */
-static void write_header(const char *sha1, const char *basepath,
+static void write_header(const unsigned char *sha1, char typeflag, const char *basepath,
struct path_prefix *prefix, const char *path,
- unsigned int mode, unsigned long size)
+ unsigned int mode, void *buffer, unsigned long size)
{
unsigned int namelen;
- char *p, *header = NULL;
+ char *header = NULL;
unsigned int checksum = 0;
int i;
+ unsigned int ext_header = 0;
+
+ if (typeflag == TYPEFLAG_AUTO) {
+ if (S_ISDIR(mode))
+ typeflag = TYPEFLAG_DIR;
+ else if (S_ISLNK(mode))
+ typeflag = TYPEFLAG_LNK;
+ else
+ typeflag = TYPEFLAG_REG;
+ }
namelen = path_len(S_ISDIR(mode), basepath, prefix, path);
- if (namelen > 500) {
- die("tar-tree: name too log of object %s\n", sha1_to_hex(sha1));
- } else if (namelen > 100) {
- char *sha1_hex = sha1_to_hex(sha1);
+ if (namelen > 100)
+ ext_header |= EXT_HEADER_PATH;
+ if (typeflag == TYPEFLAG_LNK && size > 100)
+ ext_header |= EXT_HEADER_LINKPATH;
+
+ /* the extended header must be written before the normal one */
+ if (ext_header) {
char headerfilename[51];
- sprintf(headerfilename, "%s.paxheader", sha1_hex);
- /* the extended header must be written before the normal one */
- write_extended_header(headerfilename, S_ISDIR(mode), basepath,
- prefix, path, namelen);
-
- header = block + offset;
- memset(header, 0, RECORDSIZE);
- offset += RECORDSIZE;
- sprintf(header, "%s.data", sha1_hex);
+ sprintf(headerfilename, "%s.paxheader", sha1_to_hex(sha1));
+ write_extended_header(headerfilename, S_ISDIR(mode),
+ ext_header, basepath, prefix, path,
+ namelen, buffer, size);
+ }
+
+ header = get_record();
+
+ if (ext_header) {
+ sprintf(header, "%s.data", sha1_to_hex(sha1));
} else {
- header = block + offset;
- memset(header, 0, RECORDSIZE);
- offset += RECORDSIZE;
- p = header;
+ char *p = header;
append_path(&p, S_ISDIR(mode), basepath, prefix, path);
}
+ if (typeflag == TYPEFLAG_LNK) {
+ if (ext_header & EXT_HEADER_LINKPATH) {
+ sprintf(&header[157], "see %s.paxheader",
+ sha1_to_hex(sha1));
+ } else {
+ if (buffer)
+ strncpy(&header[157], buffer, size);
+ }
+ }
+
if (S_ISDIR(mode))
mode |= 0755; /* GIT doesn't store permissions of dirs */
+ if (S_ISLNK(mode))
+ mode |= 0777; /* ... nor of symlinks */
sprintf(&header[100], "%07o", mode & 07777);
/* XXX: should we provide more meaningful info here? */
strncpy(&header[265], "git", 31); /* uname */
strncpy(&header[297], "git", 31); /* gname */
- sprintf(&header[124], "%011lo", S_ISDIR(mode) ? 0 : size);
+ if (S_ISDIR(mode) || S_ISLNK(mode))
+ size = 0;
+ sprintf(&header[124], "%011lo", size);
sprintf(&header[136], "%011lo", archive_time);
- /* typeflag */
- if (!sha1)
- header[156] = 'x'; /* extended header */
- else
- header[156] = S_ISDIR(mode) ? '5' : '0';
+ header[156] = typeflag;
memcpy(&header[257], "ustar", 6);
memcpy(&header[263], "00", 2);
- printf(&header[329], "%07o", 0); /* devmajor */
- printf(&header[337], "%07o", 0); /* devminor */
+ sprintf(&header[329], "%07o", 0); /* devmajor */
+ sprintf(&header[337], "%07o", 0); /* devminor */
memset(&header[148], ' ', 8);
for (i = 0; i < RECORDSIZE; i++)
if (size < namelen + 20 || sscanf(buffer, "%o", &mode) != 1)
die("corrupt 'tree' file");
+ if (S_ISDIR(mode) || S_ISREG(mode))
+ mode |= (mode & 0100) ? 0777 : 0666;
buffer = sha1 + 20;
size -= namelen + 20;
eltbuf = read_sha1_file(sha1, elttype, &eltsize);
if (!eltbuf)
die("cannot read %s", sha1_to_hex(sha1));
- write_header(sha1, basedir, prefix, path, mode, eltsize);
+ write_header(sha1, TYPEFLAG_AUTO, basedir, prefix, path,
+ mode, eltbuf, eltsize);
if (!strcmp(elttype, "tree")) {
this_prefix.name = path;
traverse_tree(eltbuf, eltsize, &this_prefix);
- } else if (!strcmp(elttype, "blob")) {
+ } else if (!strcmp(elttype, "blob") && !S_ISLNK(mode)) {
write_blocked(eltbuf, eltsize);
}
free(eltbuf);
}
/* get commit time from committer line of commit object */
-time_t commit_time(void * buffer, unsigned long size)
+static time_t commit_time(void * buffer, unsigned long size)
{
time_t result = 0;
char *p = buffer;
int main(int argc, char **argv)
{
unsigned char sha1[20];
+ unsigned char commit_sha1[20];
void *buffer;
unsigned long size;
+ setup_git_directory();
+
switch (argc) {
case 3:
basedir = argv[2];
/* FALLTHROUGH */
case 2:
- if (get_sha1_hex(argv[1], sha1) < 0)
+ if (get_sha1(argv[1], sha1) < 0)
usage(tar_tree_usage);
break;
default:
usage(tar_tree_usage);
}
- sha1_file_directory = getenv(DB_ENVIRONMENT);
- if (!sha1_file_directory)
- sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
-
- buffer = read_object_with_reference(sha1, "commit", &size, NULL);
+ buffer = read_object_with_reference(sha1, "commit", &size, commit_sha1);
if (buffer) {
+ write_global_extended_header(commit_sha1);
archive_time = commit_time(buffer, size);
free(buffer);
}
if (!archive_time)
archive_time = time(NULL);
if (basedir)
- write_header("0", NULL, NULL, basedir, 040755, 0);
+ write_header((unsigned char *)"0", TYPEFLAG_DIR, NULL, NULL,
+ basedir, 040777, NULL, 0);
traverse_tree(buffer, size, NULL);
free(buffer);
write_trailer();